The only thing then that i can suggest is someone testing the voltage at the fitting, some tubes like that are only rated at 220 to 240 volt a lower voltage could affect there operation, it seems unlikely, to have 2 faulty tubes, unless as Eric says the heat has affected them, though it appears that the fitting and tubes are compatible.
Thanks for all the advice. I have just ordered one new bulb, not too much wasted if it doesn’t work. I’ll also try get hold of a voltage tester to see it measure at the fitting.
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